Whittman-Hart & USWeb/CKS has joined the Ad Age/Money.com Admarket 50 Index following the $5.69 billion merger last week of Whittman-Hart and Admarket 50 member USWeb/CKS. A new name for the company will be unveiled March 23. USWeb/CKS had concentrated on Web site strategy, development and applications for Fortune 1,000 companies. Whitt-man-Hart has targeted midsize companies, and focused on back-end consulting and integration. In trading Friday, the stock closed at $50.88.